To realize a dynamic pressure type fluid bearing device at a low cost by supporting a sleeve by the spherical part and receive surface installed on this outer periphery and a pushpress spring rotatably and further posiotioning the center of the spherical part of the outer periphery of the sleeve on the center line of plural dynamic pressure generation grooves installed on the shaft.

The center of the spherical part of the outer periphery of a sleeve 11 is positioned on the center line of plural dynamic pressure generation grooves 15. Accordingly, as a force for adjusting the center of a clearance between the sleeve 11 and a shaft 14 generated when the shaft 14 is rotated 15 transmitted to the sleeve 11 effectively, the center adjustment is possible after assembly. Thereby, as a left outer frame 12 and a right outer frame 13 are replaced to a pressed part by a sheet plate with a bad accuracy but a low cost, a dynamic pressure type fluid bearing device with a low cost is possible. Further, when the center is adjusted once, a stable dynamic pressure fluid bearing device in which this state becomes hardly wrong extremely is obtained.